Steps to activate logs in magento using admin panel
using below steps you can enable logs in magento
1) Login in magento back-end
2) Go to System -> Configuration
3) from left section click on Advanced -> Developer
4) you can able to see Log Settings in main section click on it
5) Enabled set this option ‘YES’ and click on ‘save’ button on right top corner.
Now you can able to see log files in var/log folder